Is there any web-sites for "Cougars", or older women who like to date younger men?

It would be best to join up with one of the big name Dating Sites, put in your age range (for what your seeking) and do a "Two way match" to bring up other singles looking for someone of your age - That way you can see which younger guys are looking for an older woman, and you can contact them from there. If you haven't found that successful, have you thought about creating your own Dating Site with a cougar Niche? See my Hub (it's free and easy to do as a Dating Affiliate): http://hubpages.com/hub/Affiliates-Make-Money-With

Best wishes